b-u bbb bbc bbe bbk bbo bbu bcb bcc bce bck bco bcu bcv be- beb bec bee bek beo beu bev bkb bkc bke bkk bko bkv bob boc boe bok boo bou bov bub buc bue buk buo buu bvb bvc bve bvk bvo bvu bvv c-- cbb cbc cbe cbk cbo cbu cbv ccb ccc cce cck cco ccu ccv ce- ceb cec cee cek ceo ceu cev ckb ckc cko co- cob coc coe cok coo cou cov cub cuc cue cuk cuo cuu cuv cvb cvc cve cvk cvo cvu cvv ebb ebc ebe ebk ebo ebu ebv ec- ecb ecc ece eck eco ecu ecv eeb eec eee eek eeo eev ekb ekc eke eko eku ekv eo- eob eoc eoe eok eoo eou eu- eub euc eue euv evb evc eve evo evv kbb kbc kbe kbk kbo kbu kcb kcc kce kck kcu ke- keb kec kee kek keo kev kkb kkc kke kkk kku kkv kob koc koe kok koo kou kub kuc kue kuk kuu kvb kvk kvo kvv ob- obb obc obe obk obo obu obv oc- ocb occ ock oco ocu ocv oeb oec oee oeo okb okc oke okk oko oku oo- oob ooc ook ooo oov ou- ouc oue ouk ouo ov- ovb ovc ove ovo ovv ubb ubc ube ubk ubo ubu ubv ucb ucc uce uck uco ucu ucv ueb uec uee ukb ukc uke ukk uku uob uoc uoe uok uoo uuc uue uuu uvb uvc uve uvo uvu uvv v-e vbc vbk vbo vbv vcc vce vco vcu veb vec vee vek veo veu vkb vob voc voe vok voo vou vov vue vuk vuv vvb vvc vvo vvv